Topband: K9AY loop -- adding additional radials?

Joel Gray joelgray77 at
Tue Nov 13 17:51:18 EST 2018

Pete,   I added 4 radials and a 4' ground rod like you did.  I am not sure
if adding more will help, but I am pretty sure it could not hurt, so it
might be an easy test.  Another thing I did which seemed to help was to cut
the trace as described in the documentation to isolate the feedline shield
from the ground of the antenna.  I also put a feedline choke on the coax
near the antenna to try and make sure the feedline was not picking up
signals and disrupting the pattern.  My choke was 6 turns through 5 stacked
#31 cores.  I am quite happy with the performance of it.  Good luck!

On Tue, Nov 13, 2018 at 4:34 PM Peter Bertini <radioconnection at>

> Hello to the group.  I installed a K9AY system last week and added four 21
> foot radials on ground radials with a ground rod at the center.  The
> antenna didn't seem to have much directivity, so today I added another four
> 4-ft inexpensive TV type ground rods at the ends of each of the radials.
> We've had some heavy rain, but tonight I am noticing excellent nulls on
> European stations when changing directions.  The antenna is located in a
> wooded area, and I had assumed the ground was fairly conductive, but
> apparently not... would adding another set of four radials in between the
> existing four improve the system?  I am not sure how much the change
> relates to the heavy rains or adding the grounds.
> Pete
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